Power take-off for combustion gases



Sept. 19, 1950 GQDDA|D 2,523,009

- POWER TAKE-OFF FOR COMBUSTION GASES Filed March 11, 1947 ,JWTOPNEY.

Patented 19 1950 rowan Tana-on roa conmus'rlon oases ltobert H. Goddard, deceased, late of Annapolis,

Hit, by Esther G. Goddard, executrix,

Wor-

ceater, Mass assignor of one-half to The Daniel and Florence Guggenheim Foundation, New York, N. Y., a corporation of New York Application March 11, 1947, Serial No. 133,823

1 Claim. (01. Gil-45.6)

This invention relatesto combustion chambers from which gases are discharged at high speed 1 and at high temperature through a rearwardly directed nozzle. It is frequently desirable to take off power from such combustion apparatus to drive fuel feed pumps or for other useful purposes.

n is the general object of this invention to provide improved means for taking. off powerwithout interference with the flow of gases in the nozzle and with convenient adjustment as to the amount of power to be delivered.

To the attainment of these objects, a take-oi! tube is provided at the rear of the discharge nozzle, together with means for moving the tube toward or away from the nozzle axis. A further object of the invention is to provide improved means for cooling the take-off tube or the gases delivered therethrough.

The invention further relates to arrangements I and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claim.

Reference is to be had to the accompanying drawing, in which: Fig. 1 is a plan view, partly in section, showing a combustion chamber with this invention apl plied thereto; Fig. 2 is an enlarged perspective view of the charged. A take-off tube T telescopes in a conduit 8 which is mounted in a support I (is The tube T may be moved longitudinally in the conduit 8 by an adjusting screw ii.

The open end of the tube T projects into the path of the combustion gases discharged through the nozzle N, and the gases thus extracted are discharged at high speed through an auxiliary nozzle l3 and may be used to rotate a turbine-l4 mounted on a shaft l5. Feedpumps or any other 7 cllgsired apparatus may be driven from the shaft The amount of power taken off by the tube T may be varied by adjusting the open end of the tube radially with respect to the nozzle N.

As the combustion gases are very hot, the in-' take end of the tube T is provided with a casing 20 (Figs. 2 and 3) enclosing an annular jacket space 2| to which cooling water may be supplied through a pipe 24. The water in the annular space 2| cools the intake end of the tube T, and perforations 26 discharge sprays of water which cool the stream of hot gases as the gases enter the tube T.

In the construction shown in Fig. 4, the perforations 30 in the intake portion of the tube T' are placed tangentially so that the sprays of water from the jacket space Ila within the casing 204: will form a film to protect the inner surface of the tube T, rather than being directed toward the axis for primarly cooling the gas stream.

With either construction, a desired amount of power may be conveniently taken oil from the combustion gases discharged through the nozzle N, and the take-oil tube is efliciently cooled and protected from high gas temperatures. Furthermore, the amount of power taken off may be conveniently regulated.

' Having thus described the invention and the advantages thereof, it will be understood that the invention is not to be limited to the details herein disclosed, otherwise than as set forth in the claim, but what is claimed is:

A power take-off for gases discharged from a combustion chamber nozzle comprising a takeof! pipe having a telescoping portion which projects substantially radially into the path of said gases and having an intake portion which extends a substantial distance axially toward said nozzle and approximately in alignment with the path of travel of the adjacent peripheral portion of the gas stream, means to longitudinally adjust the parts of said telescoping-portion to move the intake portion of said take-off pipe toward and away from the axis of said combustion chamber nozzle to vary the power take-ofl, a casing which surrounds the intake end of said take-off pipe and provides an annular passage, a feed pipe which supplies a cooling liquid to said annular passage, said intake end of said take-oil pipe having a plurality of cooling spray openings which connect said annular passage to the in- 3 4 terior of said take-off pipe, and means to utilize UNITED STATES PATENTS the gases delivered by said take-o1! pipe. Number Nam Date 1,756,423 Daleher Apr. 29, 1930 ESTIiIER GQDDARD' 1,809,271 Goddard June 9, 1931 EICOIltflZ 0f the Last Will and -it 5 2 01 921 Goddard Oct. 8, 1935 Robert H. Goddard, Deceased.

" FOREIGN PA ENTS REFERENCES CITED Number t y Date The following references are of record in the 278,790 Great Bri a-1n 001?- 1927 me r this e m OTHER Rmmcms Astronautics, issue of June 1936, No. 34, pp. 9-11. 

